This Log Buffer Edition ventures out in the fields of Oracle, SQL Server and MySQL and picks some of the coolest blog posts for this week.

Oracle:

In Oracle, if we add a column to a table which is NOT NULL, we are allowed to do it directly, in a single statement, as long as we supply a DEFAULT value to populate any pre-existing rows.

There have been rumblings from the HPC community indicating a general suspicion of and disdain for Big Data technology which would lead one to believe that whatever Google, Facebook and Twitter do with their supercomputers is not important enough to warrant seriousness—that social supercomputing is simply not worthy.

Work-around …

Fri, 2014-10-31 11:34erkanyanar

If you want to avoid downtimes in your business, High Availabilty (HA) is a strong requirement which, by definition, makes it possible to access your data all the time without losing (any) data. In this blog we compare two alternatives: Oracle RAC and MariaDB Galera Cluster. 

There are several options to implement High Availability. Oracle RAC is a popular and proven HA solution. HA can also be enabled for your data and systems with loadbalancers that make it possible to always access your data. MariaDB Galera Cluster provides similar functionality using synchronous multi-master Galera replication. It is also easier to build and proves to be more cost-effective. Being OpenSource, you may have to pay for support, but not for running the system.

Next, the designs of Oracle RAC and MariaDB Galera Cluster are going to be compared, so you can make up …

Fri, 2014-10-31 11:34erkanyanar

If you want to avoid downtimes in your business, High Availabilty (HA) is a strong requirement which, by definition, makes it possible to access your data all the time without losing (any) data. In this blog we compare two alternatives: Oracle RAC and MariaDB Galera Cluster. 

There are several options to implement High Availability. Oracle RAC is a popular and proven HA solution. HA can also be enabled for your data and systems with loadbalancers that make it possible to always access your data. MariaDB Galera Cluster provides similar functionality using synchronous multi-master Galera replication. It is also easier to build and proves to be more cost-effective. Being OpenSource, you may have to pay for support, but not for running the system.

Next, the designs of Oracle RAC and MariaDB Galera Cluster are going to be compared, so you can make up …

The Perfect Server - Ubuntu 14.10 with Apache, PHP, MySQL, PureFTPD, BIND, Postfix, Dovecot and ISPConfig

This tutorial shows how to install an Ubuntu 14.10 (Utopic  Unicorn) server (with Apache2, BIND, Dovecot) for the installation of ISPConfig 3, and how to install ISPConfig 3. ISPConfig 3 is a webhosting control panel that allows you to configure the following services through a web browser: Apache or nginx web server, Postfix mail server, Courier or Dovecot IMAP/POP3 server, MySQL, BIND or MyDNS nameserver, PureFTPd, SpamAssassin, ClamAV, and many more. This setup covers the installation of Apache (instead of nginx), BIND (instead of MyDNS), and Dovecot (instead of Courier).

October 31, 2014 By Severalnines

When running a MariaDB Cluster or Percona XtraDB Cluster, it is common to use a load balancer to distribute client requests across multiple database nodes. Load balancing SQL requests aims to optimize the usage of the database nodes, maximize throughput, minimize response times and avoid overload of the Galera nodes. 

In this blog post, we’ll take a look at four different open source load balancers, and do a quick benchmark to compare performance:

• HAproxy by HAproxy Technologies
• IPVS by Linux Virtual Server Project
• Galera Load Balancer by Codership
• mysqlproxy by Oracle (alpha)

Note that there are other options out there, e.g. MaxScale from the MariaDB team, that we plan to cover in a future post.

…

From left: Liz van Dijk, Frédéric Descamps and Kenny Gryp

If you’re following this blog, it’s quite likely you’re already aware of the Percona Live London 2014 conference coming up in just a few days. Just in case, though (you know, if you’re still looking for an excuse to sign up), I wanted to put a spotlight on the tutorial to be delivered by my esteemed colleagues Frédéric Descamps (@lefred) and Kenny Gryp (@gryp), and …

MariaDB 10.1 server is now “Galera ready” with the latest 10.1.1 release. It includes wsrep (write set replication) patch that enables server to load the wsrep provider (galera) library and interact with it to provide multi-master synchronous replication support. The patch implements hooks inside server and storage engines to populate and apply the write sets on sender and receiver nodes in a cluster respectively. The wsrep patch also adds a number of system and status variables (prefixed with wsrep) that can be used to configure and monitor the server acting as a node in Galera cluster.

Unlike older MariaDB versions, the wsrep patch is now part of regular …

A Wolf, a Dolphin and a Sphinx walk into a bar… nevermind. We’ll skip the jokes. This post is about using SSL to set up a secure connection between MySQL and Sphinx. Serious stuff! The Idea It simple. We’re going to use Sphinx to index some data from MySQL across a secure connection. So, we’ll [...]

In recent years, GeoJSON has become a popular data format for exchanging GIS data due to several factors. The primary factors being that it’s easy to read, and it’s simple and lightweight. In 5.7.5, we added support for parsing and generating GeoJSON documents via two new functions: ST_GeomFromGeoJson() and ST_AsGeoJson(). These functions makes it easy to connect MySQL with other GeoJSON enabled software and services, such as the Google Maps Javascript API.

Since GeoJSON is a JSON format, we needed a library to parse and write JSON documents. After evaluating several candidates, we ended up with rapidjson due to its features, speed, and compatible license.

The new …

Sometimes users ask for something that doesn’t really make sense. On the first glance. But then you start asking and realize that the user was right, you were wrong, and it is, actually, a perfectly logical and valid use case.

I’ve had one of these moments when I’ve heard about a request of making triggers to work on the slave in the row-based replication. Like, really? In RBR all changes made by triggers are replicated from the master to slaves as row events. If triggers would be fired on the slave they would do their changes twice. And anyway, assuming that one only has triggers one the slave (why?) in statement-based replication triggers would run on the slave normally, wouldn’t they?

Well, yes, they would, but one cannot always use statement-based replication. If one could, RBR would’ve never been implemented. There are many cases that statement-based replication cannot handle correctly. Galera requires RBR too. And as …